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Method of fast eliminating solid matter and fluorine in wet method crude phoshporic acid

A crude phosphoric acid and solid matter technology, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as inability to obtain phosphoric acid, high bottom liquid height, and incomplete settlement

Active Publication Date: 2006-03-29
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem that the above-mentioned flocculant is used in the settlement of concentrated crude phosphoric acid, which shows that the settlement is not complete, the height of the bottom liquid is too high, and clarified phosphoric acid cannot be obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] At a temperature of 17±2°C, at 50wt%P 2 o 5 Add Na to 1.2 times the calculated amount of fluoride ion 2 CO 3 , stirred and reacted for 1 hour, then added a settling agent by 0.1% of the crude phosphoric acid volume, the settling agent was polyoxyethylene and sodium polyacrylate by mass ratio=1: 25, the total mass concentration made of was 1% aqueous solution, stirred for 8 Minutes, poured into a settling tank and settled for 5 hours to obtain clarified phosphoric acid whose bottom liquid accounted for 15%. After settling for 24 hours, the bottom liquid was compressed to 10.1%. The solid content of the phosphoric acid clear liquid is less than 0.5wt%, the fluorine in the crude phosphoric acid is reduced from 2.41g / l to 0.24g / l, and the fluorine removal rate is 90%.

Embodiment 2

[0013] At a temperature of 17±2°C, at 54wt%P 2 o 5 Add Na to 1.2 times the calculated amount of fluoride ion 2 CO 3 , stirred and reacted for 1 hour, then added a settling agent by 5% of the crude phosphoric acid volume, the settling agent was polyoxyethylene and sodium polyacrylate = 1: 75 by mass ratio, the total mass concentration made of was 10% aqueous solution, stirred for 8 Minutes, poured into a settling tank and settled for 5 hours to obtain clarified phosphoric acid whose bottom liquid accounted for 18%. After settling for 24 hours, the bottom liquid was compressed to 10%. The solid content of the phosphoric acid clear liquid is less than 0.5wt%, the fluorine in the crude phosphoric acid is reduced from 2.67g / l to 0.24g / l, and the fluorine removal rate is 89%.

Embodiment 3

[0015] At a temperature of 20±2°C, at 50wt%P 2 o 5 Add Na to the crude phosphoric acid according to the calculated amount of fluoride 2 CO 3 , stirred and reacted for 1 hour, then added a settling agent by 0.2% of the volume of crude phosphoric acid, the settling agent is polyvinyl alcohol and carboxy-modified polyacrylamide by mass ratio = 1: 30, the total mass concentration of being made into is 3% aqueous solution , stirred for 8 minutes, poured into a settling tank and settled for 5 hours to obtain clarified phosphoric acid whose bottom liquid accounted for 20%. After settling for 24 hours, the bottom liquid was compressed to 9.8%. The solid content of the phosphoric acid clear liquid is less than 0.5wt%, the fluorine in the crude phosphoric acid is reduced from 3.51g / l to 0.46g / l, and the fluorine removal rate is 86%.

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PUM

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Abstract

A process for fastly removing solid and F from crude wet phosphoric acid includes such steps as adding sodium carbonate, stirring while reaction, adding settling agent prepared from non-ionic flocculant and anionic surfactant, and settling.

Description

technical field [0001] The invention relates to the purification technology of wet-process crude phosphoric acid and the production of commercial wet-process phosphoric acid. Background technique [0002] In the production of wet-process phosphoric acid, especially the wet-process phosphoric acid produced from low- and medium-grade phosphate rock, after it is concentrated, a large amount of solids will be produced, and as the temperature of the concentrated acid decreases, secondary precipitation will occur. matter, plus the carbonization of organic matter during the leaching of phosphate rock and the abrasion of phosphoric acid material on the graphite evaporator during concentration, so that 50% P 2 o 5 The solid matter content in crude phosphoric acid of wet-process phosphoric acid is more than 2.8%, making the acid liquid black. These solids are collectively referred to as sludge. The existence of sludge is very unfavorable to the transportation and storage of commerc...

Claims

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Application Information

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IPC IPC(8): C01B25/234C01B25/235C01B25/237
Inventor 黄华侯炎学郭荣伟
Owner HUAZHONG NORMAL UNIV
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